Body Control Module (BCM) Battery Voltage Failure
The Body Control Module has detected a voltage issue in the battery supply.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The Body Control Module (BCM) isn't getting the right voltage from the battery. It expects around 12.0 to 14.5 volts when the engine is running. If it's lower, the BCM won't work properly.
What the computer is actually seeing
The BCM monitors battery voltage through its power supply circuit. If the voltage drops below a threshold level, typically around 9 volts, it triggers this code.
What a healthy reading looks like
Normal battery voltage should be between 12.0 and 14.5 volts. During cranking, it shouldn't fall below 9 volts.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check battery voltage at rest. Expected: 12.0 - 12.6 volts. If below, charge battery and retest.
- 22. Start the engine and check voltage again. Expected: 13.5 - 14.5 volts. If below 13.5 volts, check alternator output.
- 33. Inspect battery terminals for corrosion. Clean as necessary and retest.
- 44. Inspect ground connections specific to the BCM for tightness and corrosion. Repair/clean as needed and retest.
- 55. Use a scan tool to check for other related codes. If present, address those issues as they may contribute.
Common causes
- Corroded battery terminals
- Weak or failing battery
- Faulty alternator
- Bad ground connection to BCM
- Damaged wiring to BCM
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not advised, as it can lead to other electrical issues or failure of body functions.
Will this issue come back after clearing the code?
If the underlying cause isn't fixed, the code will likely return.
Why is this code appearing after a jump start?
A jump start can temporarily boost voltage, but if the battery or alternator is weak, the code can still trigger.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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